The protein expression levels of insulin receptor substrate (IRS-1) (a), protein kinase B (AKT) (b), endothelial nitric oxide synthase (eNOS) (c), sodium-glucose cotransporter-2 (SGLT2) (d), and glucose transporter type-5 (GLUT5) (e) in kidney tissues of Control, Fruc, Fruc + LP, and Fruc + LH groups. The protein levels were quantified using densitometry and normalized with GAPDH. Representative Western blot images are included above the corresponding figures. Each bar represents at least six rats. * p < 0.05, significantly different from control; #
p < 0.05, significantly different from fructose. Fruc: Fructose; LP: L. Plantarum; LH: L. Helveticus; IRS-1: insulin receptor substrate 1; AKT: protein kinase B; eNOS: endothelial nitric oxide synthase; SGL2: sodium-glucose cotransporter-2.